Patch "dccp: check sk for closed state in dccp_sendmsg()" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

    dccp: check sk for closed state in dccp_sendmsg()

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dccp-check-sk-for-closed-state-in-dccp_sendmsg.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.

From foo@baz Wed Mar 28 18:38:30 CEST 2018

From: Alexey Kodanev <redacted>
Date: Tue, 6 Mar 2018 22:57:01 +0300
Subject: dccp: check sk for closed state in dccp_sendmsg()

From: Alexey Kodanev <redacted>


[ Upstream commit 67f93df79aeefc3add4e4b31a752600f834236e2 ]

dccp_disconnect() sets 'dp->dccps_hc_tx_ccid' tx handler to NULL,
therefore if DCCP socket is disconnected and dccp_sendmsg() is
called after it, it will cause a NULL pointer dereference in
dccp_write_xmit().

This crash and the reproducer was reported by syzbot. Looks like
it is reproduced if commit 69c64866ce07 ("dccp: CVE-2017-8824:
use-after-free in DCCP code") is applied.

Reported-by: syzbot+f99ab3887ab65d70f816@syzkaller.appspotmail.com
Signed-off-by: Alexey Kodanev <redacted>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/dccp/proto.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c

@@ -789,6 +789,11 @@ int dccp_sendmsg(struct sock *sk, struct
 	if (skb == NULL)
 		goto out_release;
 
+	if (sk->sk_state == DCCP_CLOSED) {
+		rc = -ENOTCONN;
+		goto out_discard;
+	}
+
 	skb_reserve(skb, sk->sk_prot->max_header);
 	rc = memcpy_from_msg(skb_put(skb, len), msg, len);
 	if (rc != 0)

Patches currently in stable-queue which might be from alexey.kodanev@oracle.com are

queue-4.14/sch_netem-fix-skb-leak-in-netem_enqueue.patch
queue-4.14/macvlan-filter-out-unsupported-feature-flags.patch
queue-4.14/dccp-check-sk-for-closed-state-in-dccp_sendmsg.patch